عنوان مقاله :
Effect of Strain Rate on Flexural Properties of Polymer Composites Reinforced by Basalt and Carbon Fibers
Author/Authors :
Moslem Najafi Faculty of Engineering - South Tehran branch Islamic Azad University, Tehran , Mohammad Reza Khalili Center of Excellence for Researches in Advanced Materials and Structures - Faculty of Mechanical Engineering - K. N. Toosi University of Technology, Tehran , Reza Eslami Farsani Center of Excellence for Researches in Advanced Materials and Structures - Faculty of Mechanical Engineering - K. N. Toosi University of Technology, Tehran
كليدواژه :
Phenolic resin , Basalt fibers , Carbon fibers , Strain rate
چكيده لاتين :
In this study, the strain rate dependence of flexural properties in three types of polymer composites (phenolic resin reinforced by woven basalt fibers, woven carbon fibers, and woven basalt/ woven carbon fibers at a total volume fraction of approximately 35%) has been determined at different strain rates. Flexural tests have been conducted with a universal testing machine at low range of strain rate included low crosshead speed of approximately 2.35 mm/min (Strain Rate ~ 0.03 min-1), intermediate crosshead speed of 4.7 mm/min (Strain Rate ~ 0.06 min-1) and high crosshead speed of about 7 mm/min (Strain Rate ~ 0.09 min-1). Specimens with identical geometry have been used in all the tests. Experimental results showed that strain rate has a significant effect on the material response. Results showed that, both flexural modulus and ultimate flexural strength of the three types of composites increased with strain rate increasing. Also, the flexural properties of composites reinforced with woven carbon fibers are very sensitive to the test conditions of strain rate. This implies that mechanical properties determined at only one strain rate are inadequate to describe their behavior in service.
